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3- 3 Holding Tank and L&ycl Swztchp <br /> The extracted groundwater is delivered from the extraction pumping <br /> system to a 500-gallon holding tank The holding tank is wired with level <br /> switches to automatically drain the tank Switch number 1 is a high-level <br /> switch that, when triggeFed, activates a transfer pump to move the water <br /> from the holding tank into the activated carbon beds Switch number 2 is <br /> a low-level timer switch that turns the transfer pump off after a desired <br /> length of time ASE has set the timer switch at 6 minutes Switch number <br /> 3 is a high-high level switch that shuts down the EconoPump if for some <br />' reason the holding tank transfer pump does not drain the holding tank <br /> All of these pumps and switches are wired to a central electronic control <br />' panel and operate automatically <br /> 3. 4 Granulated Artivated Carbon Vessels <br />' Water leaving the holding tank is pumped to three (3) 2,000-lb liquid- <br /> phase carbon adsorbers, plumbed in series Each canister is filled with <br /> virgin 1200 mesh coconut shell liquid-phase carbon Each vessel is <br /> designed for 100 minutes empty bed contact time (EBCT) or 11 lbs/day <br /> exhaust rate A sample port is installed between each carbon vessel and <br /> just prior to inlet into the sewer pipe to allow for determination of system <br /> compliance and points of breakthrough ASE will refer to the sample <br />' ports as follows GAC 1 is the port after the first granulated activated <br /> carbon vessel, GAC 2 is the port after the middle granulated activated <br /> carbon vessel, and EFF (effluent) is the port after the third granulated <br />' activated carbon vessel <br /> .3.5 S _P1URLbZne <br /> Water exiting the carbon vessels is piped to a buried 4-inch diameter <br /> sewer pipe plumbed into the City of Manteca sanitary sewer manhole at <br /> the northwest corner of the subject site This plumbing was installed by <br /> ASE and Crutchfield Construction on September 21 and 22, 2000 A <br /> flowmeter/totalizer is plumbed into the piping within the treatment <br /> compound This meter allows for reading the flow in gpm at any given <br /> time, and also shows a running total of gallons treated The totalizer <br /> number is read at the end of each month by ASE, and that number is given <br /> to the City of Manteca Public Works Department for their use in <br />' calculating a monthly invoice for discharge into their sewer system <br /> Frank's One Stop interim Remediation System Installation Report — October 2000 <br /> -3- <br />